Motor-cooling system



Nov. 26, 1929. A.v NUTT MOTOR COOLING SYSTEM Filed' Aug. 51. 1926 '1N VENTOR en/ue A077 Patented Non, 26, 1929 man STATES MHH P ik T i,...

ARTHUR NUTT, 0F KENMORE, NEW'YORK, ASSIIIGrNOR, T0 CURTISS AEROPLAN E & MOTOR CORPORATION, .ACORPORATION OF NEW YORK MOTOR-COOLING SYSThEM Application filed August 31, 1926. Serial No. 132,674.

invention relates to heat generating Vpower plants and is concerned more particularly with the cooling system thereof.

. In a marine. engine, for example, it has been the practice heretofore, in cooling the engine cylinder or cylinders to withdraw from the body of water upon which the boat or other structure is afloat, sufficient fluid to prevent the overheating of the cylinder wall or walls. Such cooling fluid is pumped or otherwise forced directly into the cylinder water jacket or' jackets and is there heated to a temperature ranging anywhere from approximately 160 to 200o F. From the cylinder water jacket or jackets the heated fluid is conveyed or discharged directly overboard.

The present invention as distinguished from the above system contemplates a cooling system in which the heat of the fluid in circulation is constantly utilized to raisethe temperature of the fresh or incoming supply. Preferably such system comprises a fluid container from which and into which the fluid necessary to the proper cooling of the engine is respectively withdrawn and discharged. In addition to said container, two pumps or their equivalent are provided. One of said pumps operates to-withdraw from they container the fluid therein contained, while the other of said pumps operates to introduce into said container a continuous fresh supply.'

Since both pumps discharge the fluid acted upon, one hot and the other cold, into the same container, the temperature of the cold or fresh fluid upon entering said containen is immediately raised due to its admixture with the hot uid therein contained.

A cooling system characterized as above set forth is advantageous in that the temperature of .the cooling fluid at the inlet end of the active cooling circuit is substantially the same as the temperature prevailing at the outlet end thereof. It is further advantageous in' that the motor is kept constantly at that temperature found to be most economi- `cal and efficient. It is still further advantaof the circulating medium at the oppositel cylinder ends. And, it is still further advantageous in that a high rate of water circulation is obtained.

In the drawings wherein a semi-diagrauimatic illustration of a water cooled internal combustion engine is disclosed, l() designates the motor crank case and l1 the motor cylinders, each of which is appropriately j acketed as shown. As in the ordinary water cooled internal combustion engine, the cooling fluid is introduced into the cylinder water jackets at the lower end thereof and is discharged therefrom at the opposite end or ends. Instead, however, of withdrawing the water or other cooling fluid directly from the body of kwater upon. which the boat or structure is afloat, and introducing it directly into the cylinder 'water jackets, it (the water) is discharged into a suitable tank or container l2. In the embodiment of the invention selected for illustration, such tank or container 12 is located Within the V defined by the cylinder banks'. From the container l2 the fresh water supply, after its admixture with the cooling fluid previously in circula-tion, enters the cylinder water jacket at one end and from said cylinder water jackets, after its circulation over and around the cylinder walls, is discharged back again into said container 12. To obtain this specified Water circulation, two pumps instead of oneare provided. @ne of said pumps designated as `13, mayA ybe properly designated a fresh water pump.l This fresh water pump takes its supply of water from the body of water upon which .the boat or other structure is' afloat. From the pump 13 this fresh supply of water is equally distributed thru pipes 14 to suitable exhaust manifolds 15 provided, one for each cylinder bank. Within each said manifold 15 the temperature of the fresh water supply is raised somewhat `due to aninterchange of heat. After cooling the exhaust such fresh water supply is introduced into the container 12 thru pipes 16 discharging into said container at or near the bottom thereof. The second water pump, designated as.17, is preferably located directly adjacent to said container 12. It (the pump 17) withdraws its water supply from 4said container and delivers it thru pipes 18 into suitable tank-enclosed or water-jacketed oil coolers 19 thereby keeping the temperature of the oil in circulation substantially constant at all times. From the oil coolers 19 the water is delivered thru pipes 2O into the cylinder water jackets in t eusual manner and at a higher temperature than heretofore. lirorriI the cylinder water jackets the water isv discharged thru pipes 21 again into said container 12. All excess water delivered to the container 12 is carried and discharged overboard thru a suitable outlet pipe 22 lead- 'ing off from said container.

It is apparent from the foregoing disclosure that two distinct water circuits are provided, one of said circuits being a fresh water circuit whereby a fresh supply of fluid is introduced into the container 12 during motor operation, and the other of said circuits being the active cooling circuit for circulating the cooling medium over and around the cylinder walls. As no cold water is at any time introduced into the cylinder water jackets, obviously the cylinder walls are kept constantly at a substantially uniform temperature throughout. Both water pumps, if desired, may be of similar construction and driven indirectly off the engine crank shaft (not shown) by any suitable means.

While I have described my invention in detail in its present preferred embodiment, it will be obvious to those skilled in the art after understanding my invention, that various -changes and modifications may be made therein without departing from the spirit or scope thereof. I aim in the appended claims to cover all such modifications and changes.

What I claim is: 1.r The combination with a water-cooled internal combustion, motor, of an exhaust for continuously circulating thru said mani- 'fold and thereafter introducing directly into said container for admixture with the iluid therein contained a fresh supply of cooling fluid, and an over-flow leading olf from said container for carrying olf the excess cooling fluid.

2. The combination, with a water-cooled internal combustion motor, of a fluid container, an oil container, a water jacket within which said oil container is partially enclosed, a pump for withdrawing from said Huid container and for delivering back thereinto, by way of said water jacket, the cooling fluid neceary to the proper cooling of the engine cylinders and necessary to an interchan e of heat between said oil and said cooling uid;

'a second pump for continuusly introducing directl into said container for admixture with t e lluidtherein contained a fresh supply of coolin fluid, and an over-dowleading t olf from sai container for carrying off the excess coolingiuid. Y

'3. The combination with a -water-cooled internal combustion motor, of an exhaust manifold, a water jacket'within which said manifold is partially -enclosed a fluid container, an oil containera second water jacket within which said oil container is partially enclosed, a pump for withdrawin from said fluid container and for delivering ack thereinto, by way of said second water jacket-the cooling fluid necessary to the pro er cooling of the engine-cylinders, a secon continuously circulating thru said' first mentioned water jacket and thereafter introducing directly' into said fluid container for admixture with the fluid therein contained a fresh supply of cooling fluid, and an oversignature.v v

` ARTHUR 

